pieece



(No' Model.)

H. PIERCE.

STEREOSGOPE. I

No. 296,055. Patented Apt 1, 1884.

UNITED STATES PATENT OFFICE.

HOMER E. PIERCE, OF BROOKLYN, NEW YORK.

STEREOSCOPE.

SPECIFICATION forming part of Letters Patent No. 296,055, dated April 1,1884.

Application filod January 14, 1884. (No model.

scopes that are provided with ahandle orst-andard that is hinged to thebase of the instrument, whereby it may be rocked on the handle or baseand set at any desired angle therewith; and it consists in the devicesherein described and claimed, whereby the instrument may be readily andconveniently locked in any desired position and unlocked and shiftedtherefrom.

Figure 1 is a side view in outline of I a stereoscope, to the base ofwhich is hinged a handle, in the hinge of which is contained my in-.vention. Fig. 2 is an edge View of the parts constituting the hinge,together with detached portions of the handle and base of the instrumentin section. Fig. 3 is a side view, partly in section, of detached partsof the said base and handle and hinge; and Fig. 4 is a similar view,showing the opposite side of the same.

A represents a stereoscope. B is a toothed segment made fast on one ofits straight edges to the under face of the base a of the instrument.Preferably the segment is riveted or otherwise secured to a metal plate,I), that is fastened by screws or otherwise to said base. To thissegment the handle 0 is hinged by means of jaws or plates 0 c, thatproject from the end of the handle, one on either side of the segment. Apin, 01, passing through the said plates and segment, secures the platesand segment together, and forms the pivot'of a hinge on which. thesegment may swing back and forth between the plates. The hole f in thesegment through which the. said pivotal pin passes is slotted, as shown,so that the handle may be shifted up and down on the segment into theposition shown in Figs. 1 and 4, or that shown in Fig. 3. A stop-pin, e,passing through both plates 0 c, is rigidly secured in place, and it isso placed relatively to the pivotal pin d and the teeth of the segmentthat when the handle and plates 0 c are pushed upward so that thepivotal pin is at the upper end of the slotted hole f, the stoppin cwillengage the teeth on the segment, I

and when they are drawn down so that the pivotal pin is at the lower endof said holef, the said stop-pin will be disengaged from said teeth. j r

The platesc 0 may be made to suitably. grasp the segment, so that thefriction between them shall prevent their undesired movement in thehinge and make it necessary to exert a little force to shift the plateson the segment, as described.

It is evident that the instrument may be set at any desired angle on thehandle or on a standard set in a base (which may be used instead ofasimple handle) and then locked in.

position by forcing the segment down into engagement with the describedstop pin, and that the position of the instrument may be altered bydisengaging the stop-pin from the segment and swinging it on its hinge.

I do not intend to'limit myself to the precise form and construction orposition of the stoppin. Any equivalent stop attached to the handle orhinged plates may be employed. So, also, if preferred, in place of twoindependent plates inserted in the end of the handle, a single shank,rod, or plate forked at the: upper end maybe used.

I have described my lock-hinge as applied to a stereoscope; but it isobvious that it may be equally applicable to a graphoscope or any otheranalogous instrument.

What I claim as myinvention, and desire to secure by Letters Patent, is

The combination, with a stereoscope and its handle or standard 0, of thedescribed lockjoint formed of the jaws c 0, provided with the slots fand stop-pin e, and the toothed seg ment B, pivoted in the said slotbetween the said jaws, as and for the purpose described.

HOMER E. PIEROE.

Witnesses:

A. G. N. VERMILYA, A. S. FITCH.

